#include "apue.h"

#define BUFFSIZE 4096

int main(void){
	int n;
	char buf[BUFFSIZE];
	while((n = read(STDIN_FILENO, buf, BUFFSIZE)) > 0){
		if( write(STDOUT_FILENO, buf, n) != n)
			err_sys("write error");
	}
	if (n < 0)
		err_sys("read error");
	exit(0);
}
